Pump



Dec. 11, 1928.

J. zwlcKY PUMP Dec. 11, 1928. l 1,694,610 J. ZWICKY PUMP Filed Aug. ll.1925 3 Sheets-Sheet 2 Dec. 11, 1928. 1,694,610

J. zwlcKY PUMP Filed Aug. l1, 1925 3 Sheets-Sheet 3 J2 J4 '52 if Mfg-4"f l /QVf/yo/g j KM Patented @en 11, 19.28.

ILE:

JEAN ZWCKY, Oli. LGNDON, ENGLAND.

PUMP.

Application led Augustl l1, 1923, Serial No, 656.934, and in. GreatBritain I-.pril 3, m23.

This invention relates to pumps, and its main purposes are to lessen thecost of manufacture, and to increase the maximum lift the pump iscapable of giving.

lVith the first otthese purposes in view the pump has been so designedthat most et 'jts parts can be produced by stamping or pressing. Only'the cylinder body need be cast. This comprises the cylinder properi thevalve chest with valve seatings, and inlet and outlet fittings to whichpipes can be attached. rlhe interior ot the cylinder, the valveseatings, and in some cases-depending on the nature of the pipeattachment-the inlet and outlet iittings have to be machined. To lessenthe expense of machining the cylinder body is so designed that it may bemounted on a. capstan in a machine tool, and all the necessary machiningoperations may be performed upon it without other movement thansuccessive rotations of the cai stan to bring the several surfaces to bemachined into position to be worked upon. For this purpose thesur'lfaces to be machined must all be parallel or at right angles tolines meeting on the capstan axis. The surfaces oit the valve seatingsand of the pipe ttings are therefore so placed that axial lines throughthem meet in a common point upon the cylinder axis.

ln a specific construction of cylinder body the valve chest is locatedabove the cylinder, and the valve seatings are set at an inclination tothe axis ol' the cylinder with their lower edges as close as possible tothe ends of the cylinder. By this means the clearance is reduced andhigh litt rendered possible. The inlet and outlet valves for each end ofthe cylinder are co-axial, the axes of the two pairs oi2 valves meeting,as stated, on the cylinder axis. Access is had to the valve seatings formachining through openings co-axial with them in the wall of the valvechest; and these openings are covered by caps held in place by a yokeand screw. To economize space, both in the clearance space and generallythe outlet valve forms a guide 'for the stem of the inlet valve, and isitself guided in the cap which retains it.

Constructions according to the invention are illustrate-d in the accoinpanying dn wings.

Figure l is a longitudinal section and loiicitudinal section of a.

cessed at Z to receive a gland? and having extensions 8 and 9 to receivethe gland abutment and the operating handle respectively. rlhere is alsoa drain passage 1'? through the cover plate 6 which normally is closedby a plug 18. rl`his cover plate though'ot more complex `form than theplate 5 can yet be formed by pressing. rlhe piston is formed of twostampings 10, il., one fitting a coned portion ot the piston rod l2.,and the other screwing` upon the reduced end of the rod. These clampbetween them cup leathers 13, and they have projections la which preventthe cup leathers passing` beyond the edge 4ot' the cylinder ports 15.16. rthe piston rod is connected by links 1 9 to a handle socket 20pivoted on the projection 9 and adapted to receive a lever of suitablelength.

The pump shown is double-acting. There are therefore two inlet and twooutlet valves. At each end of the cylinder the seatings 21, 22 for theinlet and outlet valves are formed in the valve chest parallel to eachother and but a short distance apart., and inclined to the cylinder anisrlhis inclined position enables the lower edge or the seatings to bebrought close to the end ot the cylinder5 so that the clearance space isreduced. Access is had to the seatings for machinings and the valves areplaced in position, 'through openings 23 in the Wall oi' the valvechest.

rthe machining operations requisite on this casting are the turning ofthe cylinder7 the facing ot its ends to receive the plates 5, 6, thefacing ot the valve seatings and of the edges oi the openings 9.3i..and, in some cases, the facing or tapping` o'f the inlet and outletiittings 3, el..

The surfaces with which the cover plates make joint are at right anglesto the cylinder axis. The axes of the two sets of Valve and cap seatings21, 22 and 23 meet upon the cylinder axis where that axis is intersectedby the axes of the inlet and outlet fittings 3, Il. Thus all thesurfaces to be machined are either parallel or at right angles to linesproceeding from a common point. lmn ediately the inlet fitting* 3 hasbeen turned the casting can be mounted upon a capstan with this inletco-axial with the capstan` The cylinder can then be bored and its endsurfaces simultanew ously machined to take the cover plate. By thenturning the casting through an angle one set of seat-ings 2l. 22 and theedge or" the corresponding opening 23 can be machined, the tools workingon the surfaces 2l and 22 passing through the opening 23. ii furtherturn enables the outlet fitting l to be machined ii necessary; and yetanother turn brings the second set ot ports 2l, 22 and the secondopening 23 into position for machining. The inlet vvalve 2% has a stem25 which slides in and is guided by the hollow stem oi the outlet Valve26. rlhis hollow stem in turn moves in a recess in the cap 27. A spring28 is interposed between the two Valves and a spring 29 between theoutlet valve and the cap, by which means the Valves are normally kept ontheir seatings. The cap in turn is ltept in position by a yoke. In theconstruct-ion shown in Figures l and 2 one yoke 38 serves for retainingboth of the caps in position. It is held down by a` nut 39 upon theoutlet fitting 4 and carries set screws 30 or studs 31 abutting upon thecaps 27.

In the alternative construction shown in Figures 3 and 4: each cap 27has its own yoke 32 which engages beneath a flanged portion 33 ofthecylinder body and carries a set screw 34 bearing on the cap.

Figure 3 shows the use of a non-return ball Valve in the outlet openingwhich is 'formed as a seating for it.

l claimin a pump a cylinder body, coininising a cy inder proper, inletand outlet littings, and seatings for tappet` Valves, the machinedsurfaces oir said seatings being at right angles to lines meeting in acommon point on the cylinder axis.

2. ln a. pump a cylinder body, coniiirising a cylinder proper, inlet andoutlet .Vi i having' their axes intersecting the cylinder axis in thesaine point, and seatines for tappet valves, the machined surfaces oisaid seatings being at right angles to lines meeting at the intersectionof the axes oit Jfhe inlet and outlet tittings.

3. n a pump a cylinder casting comprisinga cylinder proper, Valve chestintegral therewith having fluid paf-sages therein communicating with theends of the cylinder, and valve seatings termed in said chest inclinedto the axis of the cylinder and at right angles to axes meeting on theaxis oi the cylinder.

Ll. ln a pump a` cylinder casting comprising a cylinder proper, a valvechest integral therewith having fluid passages therein communicatingwith the ends of the cylinder, and co-axial pairs ot valve seatingsformed in said chest inclined to the axis oi the cylinder and at rightangles to axes meeting on th'3 axis of the cylinder. i

5. A cylinder and valve chest casting for a reciprocating pump havingthe axes ot all its machined surfaces meeting in a common point.

In testimony whereof l have signed my name to this specification.

JEAN ZVVICKY.

